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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a9b5e6e66110caf9709b67b556658441948e1d16c6491b74979214560ea548' 
  AND token = 'OcwnjICmwHZcCaixO4eQv2+4irUho+h51dFqljF2Pbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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