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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb6bda0063a4b4623b03726896749c380d9045d5f41da68bfe33ac3b244b63c' 
  AND token = 'h32x2wQR0hhCEcCZlOeyldbBjF0vIg4aUkoB9AXurpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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