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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9ed95ba2714f0218b9022ff48b74a3cf9badccfe6fa9f76866ddec14d1adb3' 
  AND token = 'KLM6cnxxnrHI5NiOK9yQP0BvXew3Clt09q0/6beKYiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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