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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b198b81ff4ae3cf744b327196a29f69258ddda22f6f8f774e8d13d4328fd1f0e' 
  AND token = 'JufI2ithd+B8QNq06kZGIe2Snahxt9xRgfDg1+VM04Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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