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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87dea40a6d4166fc52a1d19667cbb483f81b3af7909020c61c0811a87a350d6' 
  AND token = 'cO4awSAGxIVZ9wIPDrWJMvmaM7/KQ0poUUancOnUYqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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