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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1573816709de00126de4f73a4b0109c8584ad7236575e6be593fa1d1dfb27e' 
  AND token = 'piVsFM8a/6l6zNEahWqyeqL6DMSOreusSb2NcNqxyBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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