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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd562a52b4e9088ea8b9358fa723a370fb5d27d4df00bba5266b8c8d27e7e4dd5' 
  AND token = 'ycrtGF340nLl4UZFwhMkMFaV7DaJLI3tCd9OzbwRNzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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