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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a000867201e272f94ec8dc4c9a39336dc6e0ba6e59584771284030a7ee4397' 
  AND token = 'QMqj+dThYGZHXJCrr212lLp8RJcNvmTUXbv4rmLdSKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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