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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f59950a9aa6812c8ea9a8268715a44b30c37801a73ac03819cfbca8008b78a' 
  AND token = 'bnMjGqlN8PUrYy400mFzlybpMlc2HSe+vThYnNyIRAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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