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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbffa3e18eb5a21a2ac0a266027f5557124d1991471a87aa1ded45bd45e86cc5' 
  AND token = 'UxSqLbWWIinKtQikeyf+zWnGthBHsV9+U8xsv78Hnr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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