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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6aa9b86785ccdf07981c9cb099769127d4141e8293522aad2b8e582be897cb' 
  AND token = '1bEndnUDBGUUOvc4KJqR8u2qzxk0jjIkBpEROy40AT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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