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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce36053d8362e229ad38ea2d7d6cb7ba62c19fcbc8353f7cf8c270db2495f7b' 
  AND token = 'YnaHhS+rkurXenIq9sP1QR88OUAfPE5NROCC7ZlBJEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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