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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89417c699ef984bf8ea0c40cdd2d41a0abb258c60a39f44c00d9a0d5c7a09c5' 
  AND token = 'oD5N+mk8K5paEHmEpczRwVK6pGSdDIqJNk7lDV6HzA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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