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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94eea8e49561e7a44a8f3382ef4f64ae0db800d91907f52a3c54814d77a71171' 
  AND token = 'FSS/ujCBljdE7y4tURR4d2kO1iip8tRSNKDhNvqAMDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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