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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2635af769d07b3bf5ce1ce05b66f50e7a713b1465c4b67022a0d7c7ef7d36817' 
  AND token = 'Gw5e3uf9UuRKuEqkeWMBfX6O5cd022gvW4ygPnWhPoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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