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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b5550996af37055232cfe576624da00ded926defd57c26d155258637c9a85f' 
  AND token = 'G6jwBlo3fT1g2ESrqKFN3r0xCotzAfLyH/BbW2VssXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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