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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8842617c3432dda4da32419df2b9742a896ff0d72c060bdaf21db4187a164949' 
  AND token = 'XTffPQ4jL5zHUI+frNx3rGSg7W3NRILq+B3GS0Y1UAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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