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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d13de1871511a3c3bc4079844e4d5c395dac134bbbca05814d8ed5b6d53a09d' 
  AND token = 'Cc7wxgIRsrtGc2n0CAZQz2ZFC++JxNLqbZP0IvjaWI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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