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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f72a96970995b7d3b11e7521a6e26a7dbffe5483468cda0bd92aaf03155c50' 
  AND token = 'Mlm/20S4YkCfQPRamOxq3J0XCf3ch0VhRJrMUu+odXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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