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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b94258574ba8d2c9cc91efa6f25b5b4bd66a9b500d4478ec057ae4dba12655' 
  AND token = '0ceh5LK2btVaAdTP3E94ImfiiiJTDKlLc2MnAYAupx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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