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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19261c8f4cb24d3c28de44f4c75f9a029825d2d16002cce3184c9a95ff3cd25e' 
  AND token = '1BYv9LZwbyBtz6ISOOfFWNphT5GUiyfwGH1fTixDj5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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