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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c630a2f507de8cf3cea9c5c2705be9a7f7a9269e27db98b5f98d0febe500d17b' 
  AND token = 'n+6GvxYMZray7a0gQXMm9uzT1amiMtMzZnzYAV1TILE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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