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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead54b643d6bca48e744f4ce964888b32ec0ff28502dab2aa00c9f3cb5f4a8ea' 
  AND token = 'zcmghantwE8yjrfkowSsi/7/pAHIDoMQSuQwamuVhak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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