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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2999940484562c842b2a4ac5462bb20d2c9ba81505c1d5c892ab7703e5a0c211' 
  AND token = 'vv9B6EVqsJrKYct80o4fa6saRtcI/1bhdw2XjnbE1ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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