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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c227dc7b316866e911875f2e9b32ca9263e0f68ccbe2b5a515fb96531dd114e3' 
  AND token = 'mW+bpg9LMWFoEmQA8mgAsuWVwdr0kFXi+hRu1xqNmu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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