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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18100dca0a87facdd27f85b56698c2b3696c62fd5d9f02f1aefe39d967d7a11' 
  AND token = '9xXMopFaj3U3RIMGhQRWus+SNDPNg2Zgbl77DJ7Vlfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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