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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25bbf19d5c5d6319589e4c5f6557c25db98cd001afd7476b8fb2f8f46ec3550c' 
  AND token = 'rXUxSVVWkCAYyQQGgX9CUdtdqmDTItVBsAeiBfMkt5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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