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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472c3dd42026cbad08db135715ec0621045411b86a31cb84273b7646a90a3b1d' 
  AND token = '7aTL6GUxMObUjXcW/R+C+LXX1eNI1gES7luckiUlf6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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