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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30f9f225f4dd6281b66d6861c17d847966562b9801b9cb9ad258db8d8c9b7ba' 
  AND token = 'L/dDmG/gQaXp4Dy2SJb7XrW8oR6CxMuz9vwMzwwA7zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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