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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2450e2630999e5ef1489ed06831e85744ea8200ca896b0e0751fbdfd315bc85e' 
  AND token = 'P7qXOOYoH4d40gM8tKxIP4QDVSVbhrTxOLYtU0P6YoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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