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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299d117cade1c676af01be5f06699c810ff6e588d6622f3735137c359a2576eb' 
  AND token = '1CC3x/AaJo6xccq112/5fsM4hWTbIwK11BTyB+BnQGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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