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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe63dcc8a3d4993d784f58acdb6af9f2265b1f7458d73fe4bcf789ae18d04341' 
  AND token = 'RR8THfNn7uxvasf1k6MBG7lqoxwlyo/jHCssrcFXtVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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