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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db231a41f94acb3cd162604843c1e58b65e3bfffc7f5832693d5dfa31d577e0' 
  AND token = 'ue09shbHC4hZT9HFXQbvdxFuH1vk2CQQ0zZUkcOLOx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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