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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8b06d40c4a19b18938fdd8ed6e9c07ebd4b52c3a1de3267dad01a1e67ac18c' 
  AND token = 'gLCkMZgSbRcOC5KWLtEmkuabvOha3v8zwI46UowHBGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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