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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca7e14596de0a5e4004aaa69ecb41091f58d5b75e34b7b990ad9b72b2560a05' 
  AND token = '3XObBURS5jb3Ym02+ZOL22tuSpZSYIpTeWzOfKNrs5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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