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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d695d68a2a04f8bdc4d04e6b80cd5deee18a03934866b741e870c741180f823' 
  AND token = '4SEqyyuhs5/ajtgSC3vpv11CjDAVmZH32k5ckakqk4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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