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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '741e6ae18f4252ede2f4004a8c56beca0f815e4b680e55f171feee613eb419a8' 
  AND token = 'NXJ8WvvVSSRWLt5n4Jcvq/6sg65XYlFA/LY0E2p7Pos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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