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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea74a0f277adce01d3c4cbb28e627fd2f1f15d626ab17eb761c019f43b95034' 
  AND token = '8p0KFLOhdgoUoVoPa5V9SgvzOWHMMHl3wVIm1mRQceM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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