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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cca49c32893276ccb72505c44ad146005a500af9f93d1f23b817a8642912481' 
  AND token = '8T+HkSdYzLUCqQkf2icU1qdtr/ArSTY+Ol5Nj6bnmjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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