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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9497814c41178debcd4d3eb81386fe95352988b5a4f506ad3742cf5f4a3e95e3' 
  AND token = '7EHUUNZy2qTuMhpahEc+Byfh2A6OGK1bOOc6CmzwbFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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