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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69083b69ecb6342465db9fb6d48d9b6c629522ca780a2b6e482ff55e97a92ae' 
  AND token = 'opwbqt2BG/iqUY1aBWlzULQMpkfssa+qnouDNAWSs5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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