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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ee97f2a881f4e969203880a3963c69a8358eff80eaf8aa53e41a9de4eab654' 
  AND token = 'vwsLomu4bBvuT/VPeckK9xlNtwCFdslV8g2SQjuOdO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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