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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e68439fc79bafa0dcd30a4e37c1690a1b6a711cef2569204f6de633f7318809' 
  AND token = 't4DKsmZvKUmGoIWtZuM4/RZIqGbl6fOX3JkaC6maWJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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