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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256eec6f5a720a4f05121f8fd80a2c99c8a05c7d8f605fbb5c5f7fb9eda7e179' 
  AND token = 'rrbsBMnkSHFFbyQWE0dlyOHpF2q+cuHrvwJqXQDYLUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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