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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1855318fbcbb4577db8e8c330011fbf910bbc1c35cf6bff0609c2d9b80bfd1' 
  AND token = '+1fdvLVl8Re4YBj1YcxOjEnVSXF4snhZ8HnwBPoZY7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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