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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9f14cfad5af8333e82902dd467caddf63e1ffb34fd881167b23f1bf73175ca' 
  AND token = '7DB7XkCYr8PQqf9+fd0Po23jM/3lFiAl7wXH0ZTQVMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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