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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3382d14a95f9c3ab59ce2c9fb9afc37ae05e52ded1c634965b335854b5df86dc' 
  AND token = '+GmaRFRP+uKbeLzWsJpPRQsaL0yrTfuPAp8RUw3uTDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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