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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e3d343d29cd2ef62ea81ef63dcc01d4c84c50bb155f8278b78cfe3850929f2' 
  AND token = 'nvPJOhMJ0yx7GoPbzZe3Uae4jxjYsK0CdsKcr0UoSao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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