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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76c2fefd0c9b2723d94c8ef2df0ebf4f1708c4c6d4c8f7bee68726263a64c43' 
  AND token = '6dXce79pyEodjzn0eY7vMDeYuv68oEFWl0FzvwpPf/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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