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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63120b5d4e13769ac996c88cbc38c0b3d5d63c254a95c1838e3364788793f83' 
  AND token = 'DGdyiyYvvhlTugg1EA7n5gpEAe+criVYs9G0NU3Uzz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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