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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32510b1b9ea7807e06a9c6a4d1ad2e62a4d45540a6a155e27be01227bee7fea9' 
  AND token = 'rzJKOezufCv5mTmf3tieDSvQyLmBUc24+zmA04jef28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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