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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361be229df92800ee45477c83745a29d0e775b5946e8daf9c19e07b439b93d90' 
  AND token = '4IIjonWAi9XsZ/1k2lgq9GiQnaw5dXyioap26cJfQmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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