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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fb825c08b7f725515096d7cdb53c13d66cac9f5585f3d6f5a20a657dc6c8a12' 
  AND token = 'q6/Ex0R5/CfaDRYxmIfT8H4fli55ypqSCd009XhSH6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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