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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20a1242611c7df2a77ecd1d22ef6302f9da3279fc29ed116d09709cc0f31f55' 
  AND token = 'uswZRVxKyrOw+ex2iRcPiPW33ZWzYKLIcj4cp50lk4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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