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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b72fbd27bad394d6e0f00d9735b6acc0aa58b73f4dd4ed5d620136cf94dcb5' 
  AND token = 'YCpxfDV9+CyYKZKlxSQYS8mzkNjkJaEP9YEtvE8FYsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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