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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9310e352a652013140d78462538da842a70e56b8392e2d7395978a21755317' 
  AND token = 'HFWHW7eo3VJVJg8BTphEdOdvahC8fW3Fk2LebNdW5vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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