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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8817ba74bdc88ab6028535f87f9c95af5d4a242d4c5c126d0d4434ff3e2dfa5b' 
  AND token = '63iLJcVlKoIl6SewY1kIKPPrn7rsxTurgsZX05f1y0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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