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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3adf217287fc5937a83d57bea985a3df56aaa2cf9861292239e76522cce3c52' 
  AND token = 'olUooPtz1QI6lvVncLhvtiZlNkzD1JoSpPNCsySN/0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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