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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a374c57973ca0d75680599104397f01193d6f35f16f83d39ac0706e2fbc21ebc' 
  AND token = 'aKxqJrsUyCpFcCAXeD4RZYb1l/Wzo8CF2TywMaBQ31k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}