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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc03a948da1c9fa592dd3362a5ec591fa525830975c6da25bc59b46b61da51a' 
  AND token = 'cKcbj9u8WUKp3gQY8mGVxfyB7bm+9ZQMeWmYr+uSsT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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